5GC的各实体功能介绍

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Access and Mobility Management function (AMF)
        -        Registration management.
        -        Connection management.
        -        Reachability management.
       
Session Management function (SMF)
        -        Session Management e.g. Session Establishment, modify and release, including tunnel Maintain between UPF and AN node.
        -        Control and coordination of charging data collection at UPF.
User plane function (UPF)
        -        External PDU Session point of interconnect to Data Network.
        -        Packet routing & forwarding
        -        Traffic usage reporting.
        -        QoS handling for user plane
Policy Control Function (PCF)
        -        Supports unified policy framework to govern network behaviour.
Network Exposure Function (NEF)
Network Repository Function (NRF)
Unified Data Management (UDM)
        -        User Identification Handling
Authentication Server Function (AUSF)
        -        Supports authentication for 3GPP access and untrusted non-3GPP access
Unified Data Repository (UDR)
        -        Storage and retrieval of subscription data by the UDM.
Network Slice Selection Function (NSSF)
        -        Selecting the set of Network Slice instances serving the UE;
        -        Determining the Allowed NSSAI